src/reloc.c

   1 /* reloc.h
   2    Implements swf_relocate(), which changes the id range of a swf file in
   3    memory.
   4
   5    Part of the swftools package.
   6
   7    Copyright (c) 2001 Matthias Kramm <kramm@quiss.org>
   8
   9    This file is distributed under the GPL, see file COPYING for details */
  10
  11 #include "flash.h"
  12
  13 static struct swffile file;
  14
  15 int slaveids[65536];
  16
  17
  18 void map_ids_mem(u8*mem, int length);
  19 static struct swf_tag* map_ids(struct swf_tag*tag)
  20 {
  21     map_ids_mem(tag->fulldata, tag->fulllength);
  22     return tag;
  23 }
  24
  25 void maponeid(void*idpos)
  26 {
  27     u16*idptr = (u16*)idpos;
  28     if(slaveids[*idptr]<0) {
  29         logf("<error> Trying to map id never encountered before: id=%d", *idptr);
  30         return ;
  31     }
  32     logf("<debug> mapping %d to %d", *idptr, slaveids[*idptr]);
  33     *idptr =  slaveids[*idptr];
  34 }
  35
  36
  37 // take a memory region which contains a tag, and
  38 // map the ids inside this tag to new values
  39 void map_ids_mem(u8*mem, int length)
  40 {
  41     int num=1;
  42     struct swf_tag newtag_instance;
  43     struct swf_tag*newtag = &newtag_instance;
  44     reader_init (mem, length);
  45     swf_read_tag(newtag);
  46
  47     switch(newtag->id)
  48     {
  49         case TAGID_PLACEOBJECT:
  50             maponeid(&newtag->data[0]);
  51         break;
  52         case TAGID_PLACEOBJECT2:
  53             // only if placeflaghascharacter
  54             if(!(newtag->data[0]&2))
  55                 break;
  56             maponeid(&newtag->data[3]);
  57         break;
  58         case TAGID_REMOVEOBJECT:
  59             maponeid(&newtag->data[0]);
  60         break;
  61         case TAGID_STARTSOUND:
  62             maponeid(&newtag->data[0]);
  63         break;
  64         case TAGID_DEFINESPRITE: {
  65             u8*mem = &newtag->data[4];
  66             int len = newtag->length-4;
  67
  68             while(1) {
  69                 u8*fmem = mem;
  70                 int flen = len;
  71                 struct swf_tag sprtag;
  72
  73                 reader_init (mem, len);
  74                 swf_read_tag (&sprtag);
  75
  76                 mem = getinputpos();
  77                 len = getinputlength();
  78
  79                 if(sprtag.id == TAGID_END)
  80                     break;
  81
  82                 map_ids_mem (fmem,flen);
  83             }
  84         }
  85         break;
  86         case TAGID_DEFINEBUTTON2: // has some font ids in the button records
  87             num++;
  88         //fallthrough
  89         case TAGID_DEFINEBUTTON:
  90             reader_init (newtag->data, newtag->length);
  91             readu16(); //button id
  92             if(num>1)
  93             {
  94                 readu8(); //flag
  95                 readu16(); //offset
  96             }
  97             while(1)
  98             {
  99                 u16 charid;
 100                 if(!readu8()) //flags
 101                     break;
 102                 charid = *(u16*)getinputpos();
 103                 maponeid(getinputpos());
 104                 readu16(); //char
 105                 readu16(); //layer
 106                 readMATRIX();
 107                 readCXFORM();
 108             }
 109             // ...
 110         break;
 111         case TAGID_DEFINEEDITTEXT:  {
 112             u8 flags1,flags2;
 113             reader_init (newtag->data, newtag->length);
 114             readu16(); //id
 115             readRECT(); //bounding box
 116             resetbits();
 117             flags1 = readu8();
 118             flags2 = readu8();
 119             if(flags1 & 128)
 120                 maponeid(getinputpos());
 121         }
 122         break;
 123         case TAGID_DEFINETEXT2:
 124             num ++;
 125         case TAGID_DEFINETEXT: {
 126             int glyphbits, advancebits;
 127             reader_init (newtag->data, newtag->length);
 128             readu16(); //id
 129             readRECT(); //bounding box
 130             readMATRIX(); //matrix
 131             resetbits();
 132             glyphbits = readu8(); //glyphbits
 133             advancebits = readu8(); //advancebits
 134             while(1) {
 135                 u16 flags = getbits(8);
 136                 printf("define text flags: %02x\n", flags);
 137                 if(!flags) break;
 138                 if(flags & 128) // text style record
 139                 {
 140                     if(flags & 8) { // hasfont
 141                         maponeid(getinputpos());
 142                         resetbits();
 143                         readu16();
 144                     }
 145                     if(flags & 4) { // hascolor
 146                         if(num==1) readRGB();
 147                         else       readRGBA();
 148                     }
 149                     if(flags & 2) { //has x offset
 150                         resetbits();
 151                         readu16();
 152                     }
 153                     if(flags & 1) { //has y offset
 154                         resetbits();
 155                         readu16();
 156                     }
 157                     if(flags & 8) { //has height
 158                         resetbits();
 159                         readu16();
 160                     }
 161                 } else { // glyph record
 162                     getbits(glyphbits);
 163                     getbits(advancebits);
 164                     break;
 165                 }
 166             }
 167             break;
 168         }
 169         case TAGID_DEFINEFONTINFO:
 170             maponeid(&newtag->data[0]);
 171         break;
 172
 173         case TAGID_DEFINESHAPE3: // these thingies might have bitmap ids in their fillstyles
 174         num++; //fallthrough
 175         case TAGID_DEFINESHAPE2:
 176         num++; //fallthrough
 177         case TAGID_DEFINESHAPE: {
 178             u16 count;
 179             int t;
 180             struct RECT r;
 181             reader_init (newtag->data, newtag->length);
 182             readu16(); // id;
 183             r = readRECT(); // bounds
 184 //          printf("%d shape bounds: %d %d %d %d\n",newtag->id,r.x1,r.y1,r.x2,r.y2);
 185             resetbits();
 186             count = readu8();
 187             if(count == 0xff && num>1)
 188                 count = readu16();
 189 //          printf("%d fillstyles\n", count);
 190             for(t=0;t<count;t++)
 191             {
 192                 int type;
 193                 u8*pos;
 194                 pos=getinputpos();
 195 //              printf("%02x %02x %02x %02x %02x %02x %02x %02x\n",
 196 //                      pos[0],pos[1],pos[2],pos[3],pos[4],pos[5],pos[6],pos[7]);
 197                 type = readu8(); //type
 198 //              printf("fillstyle %d is type 0x%02x\n", t, type);
 199                 if(type == 0) {
 200                     if(num == 3)
 201                         readRGBA();
 202                     else
 203                         readRGB();
 204                 }
 205                 if(type == 0x10 || type == 0x12)
 206                 {
 207                     readMATRIX();
 208                     resetbits();
 209                     readGRADIENT(num);
 210                 }
 211                 if(type == 0x40 || type == 0x41)
 212                 {
 213                     resetbits();
 214                     // we made it.
 215                     if(*(u16*)getinputpos() != 65535)
 216                         maponeid(getinputpos());
 217
 218                     readu16();
 219                     readMATRIX();
 220                 }
 221                 //...
 222             }
 223         }
 224         break;
 225         default:
 226         break;
 227     }
 228 }
 229
 230 static int*bitmap;
 231
 232 static int get_free_id()
 233 {
 234     int t;
 235     for (t=1;t<65536;t++)
 236     {
 237         if(bitmap[t] == -1)
 238         {
 239             bitmap[t] = 1;
 240             return t;
 241         }
 242     }
 243     return -1;
 244 }
 245
 246 void swf_relocate (u8*data, int length, int*_bitmap)
 247 {
 248     int pos;
 249     bitmap = _bitmap;
 250     read_swf(&file, data, length);
 251     memset(slaveids, -1, sizeof(slaveids));
 252
 253     pos = 0;
 254     while(file.tags[pos].id != 0) {
 255         struct swf_tag*tag = &file.tags[pos];
 256
 257         map_ids(&file.tags[pos]);
 258
 259         if(is_defining_tag(tag->id))
 260         {
 261             int newid;
 262             int id;
 263
 264             id = getidfromtag(tag); //own id
 265
 266             if(bitmap[id] < 0) { //free
 267                 newid = id;
 268             }
 269             else {
 270                 newid = get_free_id(id);
 271             }
 272             bitmap[newid] = 1;
 273             slaveids[id] = newid;
 274
 275             logf("<debug> sprite id %d mapped to %d",id, newid);
 276
 277             setidintag(tag, newid);
 278
 279             logf("<debug> [sprite defs] write tag %02x (%d bytes in body)",
 280                     tag->id, tag->length);
 281         }
 282         pos++;
 283     }
 284 }
 285